The Problem with Pre-aggregated Metrics

Pre-aggregated metrics and time series form the backbone of many monitoring setups and have many redeeming qualities, but simply aren't sufficient for capturing the many ways things can go wrong in modern or complex systems. Problems inherent in the concepts behind and implementation of pre-aggregated metrics prevent them from being effective for any sort of debugging or diagnostics; we'll talk about why that is, and what techniques we should be leaning on instead.